LED display as a high-tech products has aroused great attention, the use of computer control, the optical and electrical integration of large-screen smart display has been applied to many fields. LED pixel display using LED light-emitting diode, the number of light-emitting diodes arranged in lattice together to form LED array, and thus constitute the LED screen. LED drive through different, get different effects images. Therefore, the merits of driver chip, LED display on the display quality plays an important role.
LED Driver IC chip can be divided into general and special chip. Universal LED display chip generally used for low-end products, such as the indoor, single, two-color screens. The most common general-purpose chip 74HC595, with 8-bit latch, shift register and the string together three-state output. Each output of 35 mA maximum current (not constant). IC manufacturers can generally produce such chips.
As is the current characteristics of LED devices, that is the premise of saturated conduction, the brightness as the current size of the change, not with the ends of the voltage changes. Therefore, one of the greatest features of ASIC is to provide constant current source. LED constant current source can guarantee the stability of the drive to eliminate the LED flicker.
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